docs: remove unnecessary paragraphs in modernjs-module migration docs (#1177)

Author: Timeless0911

website/docs/en/guide/migration/modernjs-module.mdx

@@ -188,5 +188,3 @@ export default defineConfig({
 ## Contents supplement
 
 This migration doc is contributed by community user [YanPes](https://github.com/YanPes). Much appreciation for his contribution!
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-Rslib is designed to be the next generation solution of Modern.js Module, and we will provide detailed configuration mapping documentation as well as feature migration guides and scripts in the second quarter of 2025.

website/docs/zh/guide/migration/modernjs-module.mdx

@@ -188,5 +188,3 @@ export default defineConfig({
 ## 内容补充
 
 此迁移文档由社区用户 [YanPes](https://github.com/YanPes) 贡献。非常感谢他的贡献！
-
-Rslib 旨在成为 Modern.js Module 的下一代解决方案，我们将在 2025 年第二季度提供详细的配置映射文档以及功能迁移指南与脚本。